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Tektronix 2445 - trace doesn't go to the left edge.

 

I have this nice tektronix 2445. It works quite well, but it has one small annoyance. The trace doesn't go to left edge, regardless of setting of position knob.



Is this something that can be corrected?

/Mattis
 

There is an adjustment on the mainboard that "centers" the horizontal display.? It may also effect the readout, moving everything as a whole.? These are usually adjusted during calibration.? It concerns me that yours seems to have drifted.? That drift may indicate other problems with the calibration of the scope.

On ?Wednesday?, ?November? ?28?, ?2018? ?05?:?27?:?26? ?PM? ?CST, Mattis Lind <mattislind@...> wrote:

I have this nice tektronix 2445. It works quite well, but it has one small annoyance. The trace doesn't go to left edge, regardless of setting of position knob.



Is this something that can be corrected?

/Mattis
Chuck Harris
 

Does the readout display in the proper position?

-Chuck Harris

machineguy59 via Groups.Io wrote:

There is an adjustment on the mainboard that "centers" the horizontal display. It may also effect the readout, moving everything as a whole. These are usually adjusted during calibration. It concerns me that yours seems to have drifted. That drift may indicate other problems with the calibration of the scope.
On ?Wednesday?, ?November? ?28?, ?2018? ?05?:?27?:?26? ?PM? ?CST, Mattis Lind <mattislind@...> wrote:

I have this nice tektronix 2445. It works quite well, but it has one small annoyance. The trace doesn't go to left edge, regardless of setting of position knob.



Is this something that can be corrected?

/Mattis
 

Den tors 29 nov. 2018 kl 05:01 skrev Chuck Harris <cfharris@...>:

Does the readout display in the proper position?
I cannot tell for sure if the readout are in the correct positions. However
if I look on images on the net for Tektronix 2445 my readout seems to be
slightly more to the left. Compare my scope:


With this scope:

*
<>*

Commenting on what machineguy59 wrote, it may very well be a general
calibration problem, maybe I should check for some kind of general
calibration procedure?


-Chuck Harris

machineguy59 via Groups.Io wrote:
There is an adjustment on the mainboard that "centers" the horizontal
display. It may also effect the readout, moving everything as a whole.
These are usually adjusted during calibration. It concerns me that yours
seems to have drifted. That drift may indicate other problems with the
calibration of the scope.
On ?Wednesday?, ?November? ?28?, ?2018? ?05?:?27?:?26? ?PM? ?CST,
Mattis Lind <mattislind@...> wrote:

I have this nice tektronix 2445. It works quite well, but it has one
small annoyance. The trace doesn't go to left edge, regardless of setting
of position knob.



Is this something that can be corrected?

/Mattis
 

On 29/11/18 09:36, Mattis Lind wrote:
Commenting on what machineguy59 wrote, it may very well be a general
calibration problem, maybe I should check for some kind of general
calibration procedure?
Step 1: measure the PSU voltages and compare them with those in the service manual.
Step 2: look at the A5 control board for corrosion from capacitors.
Step 3: there are two key voltages on the A5 board upon which all other controls depend. Ensure those are correct.

The latter two are well described elsewhere in this forum and on many websites.
 

When I click on the link on imgur it shows a 2245 not a 2445!

Roger
Chuck Harris
 

First, and quite importantly, you don't have a 2445,
but rather a 2245, they are very different scopes.

Second, the 2245 scope you show has the readout close
enough to the proper position to eliminate any major
issues.

That tiny little difference on the left edge is accounted
for by calibration. The amount a scope needs to go past
the left or right graticule lines is usually not specified,
but amounts to enough so that you can always reach the
graticule line at all sweep speeds.

The calibration section of the manual will show you how
to correct it.

-Chuck Harris

Mattis Lind wrote:

Den tors 29 nov. 2018 kl 05:01 skrev Chuck Harris <cfharris@...>:

Does the readout display in the proper position?
I cannot tell for sure if the readout are in the correct positions. However
if I look on images on the net for Tektronix 2445 my readout seems to be
slightly more to the left. Compare my scope:


With this scope:

*
<>*

Commenting on what machineguy59 wrote, it may very well be a general
calibration problem, maybe I should check for some kind of general
calibration procedure?


-Chuck Harris

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